BIOL 1020 Lecture Notes - Lecture 31: Start Codon, Transfer Rna, Intron
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Rna is the intermediate between genes and the proteins for which they encode. Lecture 31 the genes you get from mom and dad, ex: the hair color gene being given to you from your parents. Transcription is the synthesis of rna under the directions of dna transcription makes mrna. Translation is the synthesis of a polypeptide, which occurs in the direction of mrna. Enzymes in the eukaryotic nucleus modify pre-mrna before the genetic messages are dispatched to the cytoplasm. Some parts of the molecules are cut out and the other parts spliced together pre-mrna is always bigger than they have to be, so they are taken apart and the most important parts are kept. Rna splicing removes introns and joins exons, creating an mrna molecule with a continuous coding sequence. Functional and evolutionary importance of introns: some genes can encode more than one kind of polypeptide, depending on which segments are treated as exons during rna splicing.